1. Physical properties: Polypropylene is a non-toxic, odorless and tasteless milky white high crystalline polymer with a density of only 0.90~.091g/cm3, which is one of the lightest varieties of all plastics. It is particularly stable to water, with a water absorption rate of only 0.01% in water and a molecular weight of about 8 to 150,000. Good formability, but due to the large shrinkage rate, thick-walled products are easy to sag. The surface of the product is glossy and easy to color. Bed wedge pillow specifically designed for ultimate relaxation and recreation. Use to elevate your head or recline comfortably for instant relief. To maximize comfort and fit your body`s shape, back wedge pillow FEATURES A LAYER OF HIGH DENSITY MEMORY FOAM for enhanced sleep. With this ultra soft pillow you are guaranteed to have good nights sleep, which I`m sure you can use! Foam Wedge For Bed,Memory Foam Wedge Pillow,Foam Wedge For Sleeping,Foam Wedge Bolster Pillow Shenzhen Comfity Technology Co.,Ltd , https://www.comfitymemoryfoam.com
2. Mechanical properties: Polypropylene has high crystallinity and regular structure, so it has excellent mechanical properties. Its strength, hardness and elasticity are higher than HDPE, but at room temperature and low temperature, due to its high molecular structure regularity, The impact strength is poor, and when the molecular weight is increased, the impact strength is also increased, but the molding processability is deteriorated. The most outstanding performance of PP is the resistance to bending fatigue. For example, PP is used as a living hinge to withstand bending and bending of 7×107 times without damage. The dry friction coefficient is similar to that of nylon, but it is not as good as oil lubrication. nylon.
3, thermal properties: PP has good heat resistance, melting point of 164 ~ 170 ° C, the product can be sterilized at temperatures above 100 ° C, in the absence of external forces, 150 ° C is not deformed. The embrittlement temperature is -35 ° C, embrittlement occurs below -35 ° C, and the cold resistance is not as good as polyethylene.
4. Chemical stability: The chemical stability of polypropylene is very good. Besides being attacked by concentrated sulfuric acid and concentrated nitric acid, it is stable to various other chemical reagents, but low molecular weight aliphatic hydrocarbons, aromatic hydrocarbons and chlorinated hydrocarbons. It can soften and swell PP, and its chemical stability increases with the increase of crystallinity. Therefore, polypropylene is suitable for making various chemical pipes and fittings with good anti-corrosion effect.
5. Electrical properties: The high-frequency insulation performance of polypropylene is excellent. Since it hardly absorbs water, the insulation performance is not affected by humidity. It has a high dielectric constant and can be used to make heated electrical insulation products with increasing temperature. It has a high breakdown voltage and is suitable for use as an electrical accessory. It has good resistance to voltage and arc resistance, but it has high static electricity and is easy to age with copper.
6. Weather resistance: Polypropylene is very sensitive to ultraviolet light. Adding zinc oxide, dilauryl thiopropionate, carbon black or similar white filler can improve its aging resistance.
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